TrinketSimulation HD T22 Hunter Marksmanship

Here, you can compare expected DPS increase from trinkets.

In order to compare trinkets with this chart, look for the end of the bars corresponding to the item level of interest. However, you should simulate your own character to find your best setup. These simulations are based on predefined gear sets instead of your own, after all. This means data shown here depends heavily on the used profile with its talents, its gear, etc. and is rather giving an outlook. If your character is different from the setup used here, personal simulations are recommended.